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We can get a free oil change once a month if we use Mobil 1 15w40, we've never used that and I'm concerned how it will hold up in a 388 roller engine. Thanks for all the information and the help.

Thanks for the information and I will pass it on to my brother who will make the decision. Thanks again.

We're using the WIX racing filter. Thanks, anyone else changing it more or less often?

How many laps are people running on alky before they change oil/filter when using Brad Penn oil or Gibbs or Mobil 1? We just started back running alky and we have always changed it every 2 nights but...